Question 1 :
What is the least number that must be subtracted from each of the numbers $14, 17, 34$ and $42$ so that the remainders may be proportional?

Question 3 :
If $6a^3b, 12a^2b^2, k$ and $48ab^3$ are in the proportion, then express $k$ in terms of $a$ and $b$ <br/>

Question 4 :
At a certain school, the ratio of the number of second graders to the number of fourth graders is $8$ to $5$, and the ratio of the number of first graders to the number of second graders is $3$ to $4$. If the ratio of the number of third graders to the number of fourth graders is $3$ to $2$, what is the ratio of the number of first graders to the number of third graders?<span> </span>

Question 5 :
The cost of $30$ mangoes is less then cost of $40$ mangoes by Rs. $50$. Find the cost of $50$ mangoes in (Rs.)

Question 6 :
If a : b = 3 : 4 and b : c = 5 : 9, then a : b : c is

Question 7 :
In a certain school, there are k classes with n students in each class. If a total of p pencils are distributed equally among these students, how many pencils are there for each student?